Summary: This issue includes the following: HIV testing : principles and practice, by Mark Gersovitz. Corporate governance and performance around the world : what we know and what we don't know, by Inessa Love. A comparative perspective on poverty reduction in Brazil, China, and India, by Martin Ravallion. Adaptation amidst prosperity and adversity: insights from happiness studies from around the world, by Carol Graham. Financial transactions tax : panacea, threat, or damp squib?, by Patrick Honohan and Sean Yoder. Urban road transportation externalities : costs and choice of policy instruments, by Govinda R. Timilsina and Hari B. Dulal.